lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 17 Jul 2015 10:07:46 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, mroos@...ux.ee, herbert@...dor.apana.org.au
Subject: [PATCH net-next] rhashtable: Allow other tasks to be scheduled in large lookup loops

Depending on system speed, the large lookup loop can take a considerable
amount of time to complete causing watchdog warnings to appear. Allow
other tasks to be scheduled after every batch of 1000 lookups.

Reported-by: Meelis Roos <mroos@...ux.ee>
Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
 lib/test_rhashtable.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c
index c90777e..5ed6211 100644
--- a/lib/test_rhashtable.c
+++ b/lib/test_rhashtable.c
@@ -20,8 +20,10 @@
 #include <linux/rcupdate.h>
 #include <linux/rhashtable.h>
 #include <linux/slab.h>
+#include <linux/sched.h>
 
 #define MAX_ENTRIES	1000000
+#define RELAX_CPU_AFTER	1000
 #define TEST_INSERT_FAIL INT_MAX
 
 static int entries = 50000;
@@ -61,7 +63,7 @@ static struct rhashtable_params test_rht_params = {
 
 static int __init test_rht_lookup(struct rhashtable *ht)
 {
-	unsigned int i;
+	unsigned int i, relax_cnt = RELAX_CPU_AFTER;
 
 	for (i = 0; i < entries * 2; i++) {
 		struct test_obj *obj;
@@ -87,6 +89,11 @@ static int __init test_rht_lookup(struct rhashtable *ht)
 				return -EINVAL;
 			}
 		}
+
+		if (!relax_cnt--) {
+			schedule();
+			relax_cnt = RELAX_CPU_AFTER;
+		}
 	}
 
 	return 0;
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists